This morning, I wanted my son to put some toys away, so I told him:
These toys need to go away.
Then, I started thinking about whether this sentence is active or passive voice. The following sentences are either clearly active or clearly passive:
I need to go to the store. (active)
These toys need to go be put away. (passive)
These toys need to be put away. (passive)
You need to put these toys away. (active)
So, where does that leave my original sentence? Even though it looks like sentence #1, the true actor (my son) for the action (putting away the toys) isn't really present.
I did some research into the mediopassive voice, but that doesn't seem to apply here either.